Difficult to say, with postage stamp sized images, RB, but I suspect that my cell 'phone wouldn't be too far behind the majority of those at these sizes.

With the better high ISO capabilities of the D800, over the cameras listed by your images, I could even afford to stop the 1.8 down a little for a tad more DOF, as would likely benefit all but the shot of the tendril.

The 1.8G is most certainly sharper than the 1.4D too, which would not hurt.